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Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Product revenues	$ 232,720	$ 213,441	$ 448,434	$ 420,350
Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	100.00%	100.00%	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Product revenues	$ 113,138	$ 98,767	$ 214,878	$ 194,071
United States | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	49.00%	46.00%	48.00%	46.00%
South Korea
Segment Reporting Information [Line Items]
Product revenues	$ 21,053	$ 21,213	$ 40,149	$ 44,076
South Korea | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	9.00%	10.00%	9.00%	10.00%
China
Segment Reporting Information [Line Items]
Product revenues	$ 18,988	$ 16,390	$ 36,410	$ 34,360
China | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	8.00%	8.00%	8.00%	8.00%
Germany
Segment Reporting Information [Line Items]
Product revenues	$ 18,424	$ 18,799	$ 36,591	$ 37,639
Germany | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	8.00%	9.00%	8.00%	9.00%
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	$ 10,290	$ 7,076	$ 19,961	$ 13,235
Czech Republic | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	4.00%	3.00%	4.00%	3.00%
Canada
Segment Reporting Information [Line Items]
Product revenues	$ 10,091	$ 6,090	$ 19,073	$ 11,575
Canada | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	4.00%	3.00%	4.00%	3.00%
Japan
Segment Reporting Information [Line Items]
Product revenues	$ 9,779	$ 11,332	$ 22,013	$ 22,517
Japan | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	4.00%	5.00%	5.00%	5.00%
United Kingdom
Segment Reporting Information [Line Items]
Product revenues	$ 7,071	$ 6,638	$ 13,738	$ 13,626
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	3.00%	3.00%	3.00%	3.00%
Mexico
Segment Reporting Information [Line Items]
Product revenues	$ 5,980	$ 5,326	$ 11,561	$ 10,759
Mexico | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	3.00%	3.00%	3.00%	3.00%
Other
Segment Reporting Information [Line Items]
Product revenues	$ 17,906	$ 21,810	$ 34,060	$ 38,492
Other | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	8.00%	10.00%	8.00%	10.00%
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 119,582	$ 114,674	$ 233,556	$ 226,279
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	51.00%	54.00%	52.00%	54.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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